Photographic-printing apparatus.



W. C. HUEBNEH. PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED MAYZI. 19M.

Patented Oct. 10, 1916.

I2 SHEETS-SHEET 1.

W. C. HUEBNER. PHOTOGRAPH") PRINTING APPARATUS.

APPLICATION FILED "AYZI, 1914. I 1,201,048. Patented Oct. 10,1916.

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APPLICATION FILED MAYZI, 19l4. I 1,201,048. Patented Oct 10,1916.

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APPLICATION FILED M'AYZI, I9l4.

Patented Oct. 10,1916.

1! SHEETS-SHEET 5.

I p m w W. C. HUEBNER.

PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED MAYZI. 1914.

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W. C. HUEBNER-,

PHOTOGRAPHIC PRINTING APPARATUS.

APPLICATION FILED MAY 21. 1914.

1,201,048. Patented Oct. 10,1916.

IZ'SHEETS-SHEET 8.

M m V L MMM W. C. HUEBNER.

PHOTOGRAPHIC PRINTING APPARATUS.

' AEPLICATION FILED MAYZI, I914.

Patented Oct. 10, 1916.

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-W. C. HUEBNER. PHOTOGBAPHIC PRINTING APPARATUS.

APPLICATION FILED MAYZI, I914.

Patentd Oct 10,1916.

12 SHEETS-SHEET I l- (III' A Jill! ent subjects in a specified arrangement on used for printing UNITED STATES PATENT OFFICE.

WILLIAM CARL HUEBLIER, 0F BUFFALO, NEW YORK, ASSIGNOR TO HUEBNER- BLEISTEIN PATENTS' COMPANY, OF BUFFALO, NEW YORK.

PHOTOGRAPHIC-PRINTING APPARATUS.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed May 21, 1914. Serial No. 839,997.

To all whom it 1n ag concern I, IVILLIAM C. HUEBNER,

Be it known thata citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Photographic-Printing Apparatus, of which the following is a specification.

This invention relates to apparatus for producing photographic prints upon sensitized surfaces of plates of metal -or other material, or lithographic stones which are afterward finished in any suitable manner for printing in one or more colors.

More particularly the invention relates to improvements in apparatus of the type disclosed in Patents 954,291 and 954,292, granted to myself and George Bleistein ,April 5, 1910, which are intended for producing photographically upona sensitized surface any desired number of like or difierent prints in any desired positions and relative arrangement. Such apparatus are adapted, for instance, for repeating like prints upon a single sensitized plate or stone which is afterward used for printing a plurality of impressions and for composing purposes where it is desired to place differthe printed sheet or sheets. The apparatus are also adapted for preparing plates or stones for multi-color printing where it is necessary to make the prints in exact register on the different plates or stones that are the difierent colors. Briefly stated, the apparatus comprises a holder or support which holds the sensitized plate, stone or other part in a vertical position, a light chamber arranged in front of the sensitized part on which a transparent photographic printing plate is mounted for producing the photographic print upon the sensitized surface, and a back support or pressure device which is pressed against the rear side of the sensitized part opposite the light chamber for holding the sensitized surface in close and uniform contact with the transparent printing plate'. The light chamber and pressure device are movable toward and from each other into and out of contact with the sensitized part, and the holder for the sensitized part is adjustable parallel with the plane of the sensitized surface both horizontally and vertically between the light chamber and backsupport for placing any therefrom in various respects.

ent printing plates,

fragmentary desired portion of the sensitized .surface opposite to the transparent printing plate to receive the print.

The improved apparatus of this applicat1o n 1s similar in these general respects to said prior patented apparatus but differs The light chamber is provided on different sides thereof with a plurality of holders for transparand the light chamber in addition to being movable toward and from the sensitized surface, is swiveled so that it can be turned to place any one of the several printing plates thereon opposite to the sensitized surface. It is thus possible to mount several printing plates on the light chamber and quickly and easily bring one plate after another into position for printng therefrom. This construction also makes it possible to remove one of the holders from the light chamber and secure a printing plate thereon while the machine is being used for. printing from another plate, thereby saving much time and making it much moreconvenient to properly adjust the printing plates on the holders. The back support or pressure device is likewise rotatably mounted and is provided With a'plurality of pressure heads or members which may be of different sizes or shapes, or difierently adjusted to suit the different printing plates on the light chamber. The apparatus furthermore differs from the prior patented apparatus. in the construction and arrangement of the various parts thereof and in the provision of improved mechanisms justing and manipulating the plate holder, light chamber and back support, as herein-, after described.

In the accompanying drawings, consisting of twelve sheets: Figure 1 is a side elevation of a photographic printing apparatus embodying the invention. Fig. 2 is a plan view thereof, partly broken away. Fig. 3 is a front elevation, partly in section, on an enlarged scale, of that end of the apparatus which is not shown in Fig. 2. Fig. l is a transverse sectional elevation thereof in line 4-4:, Fig. 3. Figs 5 and 6 are respectively horizontal and vertical sections, enlarged, of the sensitized plate holder. section, enlarged, V of the sensitized plate holder. ,Fig. 7 is a fragmentary rear elevafor ad- Fig. 6 is a fragmentary transverse tized plate holder and carriage. Fig.8 is a similar View, on a-larger scale, of the same parts. Fig. 9 is a sectional elevation in line 99, Fig. 8.v Fig. 10 is a section in line 1010, Fig. .8. Fig. 11' is a fragmentary sectional elevation of the apparatus in line;

1111, Fig. 2. Fig. 12 is a plan view thereof, partly in section in line 12-1- 2, F ig. 11. Fig. 13 is a plan View thereof partly in section in line 1313, Fig. 11. Fig. 14 is a sectional elevation in line 14-14, Fig. 13.

Fig. 15 is a fragmentary plan viewpartly in section, of the sensitized plate holder carriage and its supporting means. Fig. 16 isa sectional elevation in line 1616, Fig. 15. Fig. 17 is a sectional plan in line l7-17, Fig. 16. Fig. 18 is a sectional elevation in line 1818, Fig. 15. Fig. 19 is a sectional elevation in line 1919, Fig. 18.

Fig. 20 isa sectional elevation in line 2020, Fig. 11, showing the clamping device for the light chamber. Fig. 21 is a sectional elevation in line 21-21, Fig. 11, of the actuating and stop mechanism for the light chamber. Figs. 22 and 23 are sectional elevations thereof in line 22-22, Fig. 21, showing different positions of the parts. F ig. 24 is a sectional elevation in line 24 -24, Fig. 13. Fig. 25 is a sectional elevation in line 25 -25, Fig. 24. Fig. 26 is a sectional elevation of the back support. Fig. 27 is a sectional I plan thereof. Fig. 28 is a transverse sectional elevation of the lock for holding the light chamber from turning. Fig. 29 is a longitudinal sectional elevation thereof, showing the released position thereof. Fig. 30 is a similar view thereof, showing the same in holding position. F ig. 3l is an end elevation thereof. Fig. 31 is a fragmentary horizontal section on line 3131", Fig. 3, of the adjusting mechanism for the plate holder. Fig. 32 is a sectional elevation, on anenlarged scale, in line 3232, Fig. 3, of the adjusting mechanism for the sensitized plate holder carriage. Figs. 33 and 34 are sections in line 33-33, Fig. 32, showing the inoperative and operative positions of the fine adjusting wormgearing. Fig. 35 is a sectional plan in line 3535, Fig. 32. F ig.

'36 is a sectional elevation in line 36,36, v

I Fig. 34. Fig. 37 is a front ele ation of one of the clamps for the photographic printing plate. Fig. 38 is a section thereof in line 3838, Fig. 37. Fig. 39 is a sectional plan view thereof in 1ine'39 39, Fig-37. Fig. 40 is an elevation thereof in line 40-40, Fig.

39. Fig. 41 is a sectional elevation thereof inline 4.1-4.1, Fig.40. The stationary main frame of the appa- I 'i -1'atus maybe of any suitable construction. The frame shown comprises a low hor1- zontal central portion A on which a carriage'which supports the sensitized plate or part is movable horizontally, and forwardly andrearwardly extending wings or portions into holes on the-removable holder C.

' clamp bars 0 part is secured and which is adjustablevertically in the carriage B. Theplate holder, see Figs. 3, 7 and 8, preferably comprises an adjustable rectangular frame C which is arranged to slide vertically on the upright sides 0' of the carriage B, and a rectangular frame or holder C'- on which the sensitized plate or )art is secured and which is removably hel on the adjustable frame 0 preferably by pins 0 Figs. 3 and 6 which project forwardly from the'adjustable fralr ie C his construction enables a sensitized plate or part to be secured on one holder C while prints are being made on another sensitized plate or part in another holder in the apparatus. The holder in the apparatus can then be quickly removed and replaced by the other one, thus permitting the rapid operation of the apparatus. The removable holder C shown is intended for use Witha thin metal plate orsheet (1 having a sensitized surface and is therefore provided with upper and lower horizontal clamp bars 0 carrying suitable clamps 0 for securing and stretching the sensitized plate. The clamp bars are adjustable toward and from each other on' the holder C to accommodate plates of different sizes. Each of the clamp bars 0 shown is provided atr its ends with straps 0 Figs. 5 and 6, which embraee and are adapted to slide on the side bars of the holder C, andthe clamp bar is .adjustably held on the holder 0 by screws 0 on the ends of the straps 0 adapted to enter perforationsc in the side bars of the holder C. The inner ends of the screws 0 preferably extend through the perforations '0 into holes in blocks 0 fixed to the ends of the clamp bar for the purpose of supporting the inner ends of the screws and relieving the same from undue strain. The clamps 0 may be of any suitable construction adapted to grip the edges of the sensitized plate and I which is used. Vilhen a lithographic stone is used it can be held in place between the The plate holder is preferably guided in its vertical movement on'the carriage B by beveled guide. ribs (1 on the upright sides of the carriage which extend between guide flanges d (Z on the holder frame C at the it ends the holder are adapted to be turning it.

upper and lower portions of its opposite thereof. The flanges (l' at one end of forced against the guide rib for gripping the guide rib (Z between the guide flanges to lock the frame in any position to which it may be adjusted. The means shown for this purpose comprise a shaft (Z Figs. 8 and 9, which is provided with oppositely screwthreaded end portions (P working in screwthreaded holes in wedges (l These wedges are arranged to slide between the movable guide flanges d and confining plates cl which are secured to the fixed flanges (Z by screws d passing through holes in the confining plate, wedges and movable flanges. By turning the shaft the two wedges are drawn toward each other, and acting against the inclined faces of the confining plates, force the movable guide flanges against the guide rib (Z so as to grip the rib between the fixed and movable guide flanges and thus lock the plate holder. It is only necessary to provide the locking means at one end of the plate holder, since when the beveled faced guide flanges d are forced against the beveled guide rib the guide flanges at the opposite end of the plate holder will be pressed firmly against the cooperating guide rib, thereby binding the plate holder at each end thereof. For turning the shaft to operate the locking wedges it is preferably connected by bevel pinions d and (Z to a shaft d which is suitably journaled on the carriage and is provided at its outer end with a wheel or handle pl for The beveled pinion d is journaled and held from endwise movement in a suitable bearing (Z on the carriage and is splined to the shaft (Z The shaft is thus adapted to move with the plate holder in the vertical adjustments thereof but can be turned by the rotation of the handwheel cl in any adjustment of the plate holder. Other suitable means for locking the plate holder after it is adjusted could be used.

The plate holder is adjusted vertically in the carriage, in the construction shown, by a horizontal shaft E which is journaled in bearings e on the upper end of the plate holder frame C and is provided at opposite ends with pinions e which mesh with toothed racks e on the rear faces of the upright sides of the carriage B The shaft E is connected by beveled pinions e e to an upright shaft e suitably journaled on the carriage B The pinion e is splined to the shaft 6 and is held from endwise movement in a bearing 6 on the plate holder frame C, so that the pinion will turn with the shaft but can slide thereon in the vertical movements of the plate holder inthe carriage.

In order to enable a fine or precise adjustment of the plate holder on the carriage an yetpermit of the same being effected rapidly, separate operating devices for the shaft the shaft 6 to suitable way.

provided, one for produce are preferably 1 ing a quick, coarse adjustment, and

other a fine or exact adjustment of the plate holder. For the coarse adjustment, the shaft 6 is connected by'beveled pinions e and 6 Figs. 7 and 8, to an operating shaft 6 which is journaled on the carriage B and extends to the front side thereof where it is provided with a handle 0, Figs. 1 and 3, for turning it. By turning this handle the shaft 6 can be turned to move the plate holder quickly to approximately the desired position. worm gear worm f is adapted 7, Figs. 7 and 8, with which a to mesh for turning the The shaft 6 is also provided with ashaft 6 asmall amount to produce a fine adjustment of the plate holder. The worm f 1s normally out of mesh with the worm wheel f and is secured to an operating shaft f which extends to the front of the carriage where ,it is provided with a handle f for turning it. The shaft f see Fig. 31, is-journaled eccentrically in a bushing f which is rotatably mounted in a suitable bearing f on the front of the carriage B. The bushing is provided with an arm f projecting through a slot in the bearing f and by turning the bushing by means of this handle the worm can be shifted into and out of mesh with the worm wheel; In adjusting the plate holder the shaft 6 is-first turned by means of the operating handle a to move the holder rapidly approximately to the desired position, the worm wheel f being then out of mesh with the worm f. The worm is then moved into mesh with the worm wheel and turned by its operating handle f for effecting the plate holder. ,The worm gearing enables be turned a very small fraction of *a revolution if,necessary, and the plate holder to be thus adjusted with great precision. The separately. operable coarse and fine adjusting mechanisms make it possible to secure a precise adjustment much more quickly than could be accomplished if only the slow moving fine adjusting mechanism were employed.

G, Fig. 7, represents weights attached to cables 9 that pass over guide pulleys g g at the top of the carria e B and are tened to the frame C o the plate holder for more or less counterbalancing the weight of the plate holder. These counterbalancing weights can be omitted if desired or any other counterbalancing means substituted therefor.

The plate holder carriage B may be mounted to move horizontally and may be uided in its horizontal movement in any Preferably, however, the carriage is provided at itsbottom with longitudinal beveled guide ribs H which slidably engage in correspondingly shaped guide ways It in the upper surface of the central final fine adjustment of the fasthe carriage to be moved more easily, the carriage .is preferably mounted on trucks- 71, Figs. 7 and to 17, provided with Wheels 71. which are adapted to travel on the main frame between the guide-ways k.

The trucks shown are provided with leaf springs, k which are hung at their ends on the end portions of the trucks and yieldingly support the carriage through the of screws 72. which are'threaded into bearing blocks It that rest upon the central portions of the springs if. The screws are adapted to be turnedby' a suitable tool or other means to regulate the lifting action-of thesprings on the carriage. The bearing blocks it are confined and held from turning in bottom recesses incross bars h" of the base portion of the carriage.

medium By adjusting the screws the guide-ways it.

can be relieved of the weight of the carriage to such an extent that the guide ribs will bear lightly in the guides being thusgreatly reduced without lessening the guiding function of the guides. d

I, Figs. 3 and 4, represents ashaft for adjusting the carriage B horizontally on the main frame. This shaft is journaled in a suitable bearing 2' on a bracket i rising from one end of the portion A of the main frame and is provided with a pinion 2' which I I meshes with a toothed rack i secured to a horizontal extension 2""0f the carriage. The

shaft I is preferablyprovided at its forward end with a handle 2' for turning it to effect a quick or coarse adjustment of the carriage. Worm gearing similar to that employed for the fine adjustment of the plate holder-C is also preferably employed for turning the shaft 1 to produce a fine adjustment of the carriage. Asshown in Figs. 3, 32-36, the shaft'I is provided with a wormwheel 2' with which a worm i is adapted to mesh.

. This worm is secured to an upright shaft i which is j ournaled eccentrically in a bushing 2' rotatably mounted ina suitable bearing 1' secured to the bracket 11. The eccentric bushingis provided with a handle i projecting through a slot in the bearing 25 by which the bushing can be turned to throw the worm into or out of mesh with the worm .gw11eel on the shaft 1. The worm shafti is providedat its upper end with a wheel or handle for turning it. Thecarriage is adjusted approximately to the desired position by turning the shaft I by means of: its handle 71 while the'worm is out of; mesh with the worm wheel. into mesh with the'wori'n wheel as explained,

and the shaft I turned by means of the han gearing, for effecting the dle'z' and'theworm fine adjustment of the carriage. V The described adjusting mechaniems for in the guide-ways, the friction carriage from movement.

' the divisions of the scale Z. 'vided withgraduations indicating, for ex-,

The worm is then thrown the plate holder G and the carriage Bare simple and efficient, and therefore preferred, but mechanismsof other construction adapted to perform similar results could be e1nploye v Suitablemeans are employed for locking the carriage stationarily in the position to which it is adjusted. The means shown for this purpose comprise a locking bar K, Figs. 7, 18 and 19, whichextends transversely of the carriage in a recess in a cross bar of the mg bar project under. longitudinal flanges on the, portion A of the main frame at the inner sides of the carriage guide-Ways h, and the locking bar is supported centrally upon an eccentric k on a shaft 76 which extends lengthwise beneath the carriage. The shaft k 'is journaled at its ends in suitable bearings 70* on the main frame and passes through bearings 70 dependin'g from the cross bar it of the carriage. The eccen tric k is splined on the shaft between the bearings 70 so that it is caused to turn with the shaft but is adapted to slide lengthwise thereon when the carriage ismoved horizontally. By rocking the shaft thev eccentric forces the locking bar against the flanges k on the main \frame, thereby locking the The shaftJc is turned preferably by a. lever 70 secured to' the end thereof adjacent the bracket 2'.

I0, Fig. 3, represents a latch pivoted on the bracket 2" and adapted to engage the level is for holding the shaft 76 in the normal position in which the locking bar K is released.- The latch shown is adapted to bemoved by hand to release the lever and to automatically'engage and hold the lever. When the lever is raised it strikes and swings the latch aside and the latch then swings by gravity base of the carriage. The ends of the lockholder on the carriage. The indicator L comprises an index or pointer Z which co operates with a scale Z on the carriage extension i and a graduated dial Z which is rotated by a pinion Z which meshes with a toothed rack Z on the carriage. The pinion Z is suitably geared to the dial so asto cause the dial to turn one. revolution during the travel of the carriage a distance equal toone inch or other unitof measure represented by The dial is proample, thousa dths of an inch, and it is thus pessible for the operator by observing the indicator to adjust the carriage with great accuracy to the desired position.

Z represents an undercut rib on the carria e extension which slides in acorrespondmg y shaped groove Z in the bracket which.

, be used instead of against hang supports the indicator, to prevent undesira-l ble play between the pinion Z and the toothed rack Z. The other indicator, L, comprises an index Z cooperating with a scale Z on the plate holder frame C, and a dial Z? which is driven by a pinion Z meshing with a toothed rack Z on the plate holder frame C. This indicator operates in the same manner as the indicator L. Any other suitable micrometer indicators could those shown.

M represents the light chamberor support on which the transparent printing plates are mounted and which contains an electric lamp or other source of light for illuminating the plates to make the photographic prints on the sensitized surface. The light chamber preferably consists of a rectangular casing of any suitable construction which is provided in its side walls with openings on over which are removably secured holders or disks m on which the printing plates, indicated at m are mounted. The printing plates may be secured on the holder disks and the disks may be removably secured on the light chamber in any suitable manner, permitting the ready securing, rotary adjustment and removal of the disks. As shown, each disk rests on rollers m journaled on the wall of the light chamber and is retained thereon by pivoted fingers or clamps m which are secured by screws m to the wall of the light chamber and overthe edge of the disk. The disk is thus held against the outer face of the wall of the light chamber but is adapted to be rotatably adjusted on the rollers to place the printing plate at any desired angle. When adjusted to the desired position, indicated by index marks on the disk cooperating with a graduated scale m on the wall of the light chamber, the plate holder can be firmly clamped in position by tightening the securing screws for the clamps m. In the construction shown, a heavy glass face plate m is secured on the holder disk by corner pieces m The printing plate m rests flat against the surface of the face plate and is held thereon by clamping bars a Figs. 1

- and 37-41, which are mounted on the holder disk at the edges of the face plate. Each clamping bar is pivoted centrally by a screw m on a slide block m and bears at its ends the beveled edge of the printing plate. The slide block 'm, is slidably secured on the holder disk by a dove-tailed guide piece m enteringadove-tailed groove in the slide block and is moved toward and face plate by a screw "m which turns in a lug m disk. The clamping bar is provided at its ends with screws m which extend through holes inthe bar and screw into nuts m which are. adapted to slide in slots in the holder disk. These nuts have flanges adapton the holder ed to bear against the inner side of the holder disk. Thumb screws m extending through threaded holes in the ends of the clamp block bear against the screws m. By turning these thumb screws the clamping bar can be swung to more or less of an angular relation to the slide block as may be necessary to insure a perfect bearing of the clamping-bar on the edge of theprinting plate. The slide block is then forced toward the printing plate by its screw m to cause the clamping bar to engage and hold the printing plate. hen the clamping bar has been adjusted to bear firmly on the edge of the printing plate, the screws m are turned by means of handles on projecting therefrom so as to secure the clamping bar in its adjusted position and draw the same down firmly against the beveled edge of the printing plate, thereby pressing the latter into firm contact with the face plate. The screws 11?. also hold the slide block m rigidly in place. The described securing means for the printing plates enable the same to be accurately adjusted and rigidly held in place notwithstanding irregularities in the size, shape and thickness of the plates.

The light chamber is swiveled on a supporting carriage N so that it can be turne to place the printing plate on eitherside of the light chamber opposite to the sensitized surface, and the carriage is movable on the front wing A of the main frame toward and from the holder for the sensitized plate for moving the printing plate into and out of contact with the sensitized plate. As shown in Fig. 11, the bottom of the light chamber is provided with a hub n arranged to turn on an upwardly projecting boss or axle n on the carriage N. The lightchamher is provided with a circular bottom face n which rests upon a circular track or. surface n on the carriage N to prevent the tilting of the light chamber on the carriage. In order to relieve the weight or pressure of the light chamber on this track and reduce the friction, the hub of the light chamber is preferably provided with an antifriction thrust bearing 71, which bears upon a spring n located in a cavity in the axle boss at. This spring presses the bearing upwardly against an overlying plate 11, secured to the hub of the light chamber and tendsto lift the light chamber, thus lessening, to a material extent, the pressure on the circular track. For turning the light chamber on the carriage N toplac'e one or another of'the printing plates opposite to the v sensitized part, the hub of the light chamber is preferably provided with a worm wheel at with which meshes a worm n secured to a horizontal shaft n which is journaled on the carriage N and is provided at one end thereof with a crank or handle a for turning it.

0, Figs. 1228-31, represents a bolt or the bolt. When the notch in one of the plates 0 isin register with the lug of the bolt, the bolt is moved outwardly by means of a screw 0 to cause the lug to enter the notch and secure the light chamberr In order to facilitate the locking'of the light chamber, a spring-pressed plunger 0 'is mounted in the supporting bracket 0' for the bolt. The upper end of this plunger is beveled so that when the light chamber is turned in one direction the plates 0 will engage the beveled end of the plunger and pass the same. In adjusting the light chamber it is turned until one of the plates o -engages the" spring plunger 0* and passes a slight distance beyond the same. The

light chamber is then moved in the return direction until the notched platec o strikes the abrupt. face of the plunger and is ar-- rested thereby. The light chamber will then be in position for the bolt 0 to be moved into the notch in the plate 0 P represents an electric lamp'in, the light chamber. This lamp is preferably, supported in the light chamber on a stationary or non-rotatable base plate 19, so that the lamp does not rotate with the light chamber but always throws the light in the same direction, that is,- toward the sensitized part1 A shield P of any suitable sort is preferably supported by the base plate ;0

and surrounds the sides of the lamp P to prevent the escape of light through the openings in the sides of the light chamber when changing the holders for the printing plates. The base plate p is secured centrally to the upper end of a vertical post -79, and is provided with a depending circular edge which bears upon an opposing circular face p on the bottom of thelight chamber. The base plate is utilized for pressing the light chamber down to a firm seat on its carriage, and pressing the carriage to a firm "seat on its support for the purpose of preventing any movement of the light chamber when the back support is operated to press the sensitized part into contact with the printing plate. For this purpose the post .79 extends down through the swivel bearing for the light chamber and through a clamp bar p which is located in the wing A of the main frame and is adapted to bear at its ends against downwardly facing flanges or shoulders 32 on the sides of the frame,'see Figs. 13 and 20. A shaft 12 passes through a hole in-the bottom of the post p and is provided at opposite sides of the post p with eccentrics p which support the clamp bar 32 and are adapted to draw the post p, and base plate 7) downwardly against the bottom of the light chamber when the eccentric shaft p is turned. The eccentrics are splined on the shaft 79 .and confined between the post p and bearings 79 attached to the post, so that they turn the shaft but are adapted to slide thereon when the light chamber is moved toward orfrom the sensitized part. The eccentric shaft p is journaled in suitable bearingso-n the frame and is provided.

at its outer end with a lever or handle p for turning it to clamp and release the light chamber. j

The carriage N for the light chamber may be mounted to travel on the main frame toward and from the sensitized plate porting the weightof the carriage andthe parts carried thereby and relieving the friction in the guides.

It will be apparent that the devicedescribed, comprising the base plate p and the clamping bar 37 for clamping the light chamber on the carriage N, also acts to press the carriage firmly down onthe main frame, so that the one clampingdevice acts to prevent any movement of either light chamber on the carriage or the carriage on the main frame, and the light chamber is .therefore held perfectly rigid. The light chamber could be difierently swiveled and mounted to move toward and from the sensitized plate holder, and means vdifierent from those described could be employed for turning the light chamber, looking it from turning and clamping it and thecarriage stationarily in position.)

for repeating a or making. a plurality of prints from'the same printing plate on the sensitized surface, it is only necessary to moye the light chamber' away from the sensitiz'ed part a suflicient distance to permit of the, adjustment of the latter to present successive positions of the sensitized surface to the printing plate. When, however, it is desired to turn the light chamber on the carriage to bring another printing plate into operative relation to the sensitized part, or tochange or adjust the printing plates, the light chamber is moved a considerable distance away from the sensitized part.

When the apparatus is being employed ber to be moved away from the sensitized part to any required position when desired, or to be moved quickly a short distance away from the sensitized surface and again plate holder by slide 8.

returned to the same position, in contact with the printing surface. For producing the extended movement of the light chamber, a shaft R, Figs. 1 and 11-14:, isshown which is suitably journaled on the main frame and is provided at its inner end witha pinion T which meshes with a toothed rack 1" on the bottom of the light chamber carriage N. This shaft can be turned by a crank r at its outer end. Any other suitable means for producing the extended or variable movement of the light chamber could be employed.-

For the other or limited movement of the light chamber, a shaft S is preferably provided which is journaled in suitable bearings on the main frame and is provided with an eccentric s which is adapted to reciprocate a slide 8 which is arranged below the carriage N to slide on an underlying portion 8 of the main frame A, see Figs. 11-13 and 21-25. The eccentric turns in an eccentric block 8 confined in a pocket in the slide 8. Slidably mounted on the slide 8- is an auxiliary slide 8 which is provided with upwardly projecting stops or' abutmentss adapted to engage the adjacent end of the carriage N to limit the movement of the same by the shaft R toward the holder for the sensitized plate. The auxiliary slide a is adapted to be adjusted on the slide 8 toward and from. the sensitized plate holder by suitable means, such as a screw 8 which is journaled and held from endwise move-.

ment on the slide 8' and engages in a screwthreaded hole in the auxiliary slide 8. The auxiliary slide .9 can be adjusted by the screw 5 toward or from the sensitized plate holder to the extent necessary to insure of the proper contact between the printing plate and the sensitized surface when the carriage is arrested by the stops 8- As shown, the slide 5 is provided at opposite sides with beveled flanges 8 Fig. 21, which areconfined and slide between/ guide strips a on the main frame, and the auxiliary slide is provided with beveled flanges s at opposite sides which are confined and guided between guide The light chamber carriage is adapted to be moved toward the sensitized the shaft R until arrested by engagement with the stops 8:" and the car-. riage can be moved in the opposite directionv to any desired extent. By locking the carriage to the slides the carriage and the light chamber can be moved toward and from the sensitized plate holder a distance f the in suitable bearings on centric shaft strips s on the main 'size or shape if necessary.

equal to the throw of the eccentric by turning this eccentric s a half revolution in one direction or the other. The carriage is locked to the slide 8 for this purpose, for instance by a bolt t which is arranged to slide vertically in a guide if on the end of the carriage N between the stops 5 and is adapted to be moved into and out of a recess t in the auxiliary slide s* by a pinion t engaging rack teeth on the bolt. This pinion is secured to a shaft t" which is journaled the carriage and extends to the side thereof where it is provided with a handle 5, see Fig. 12; After the stops .3 have been once adjusted to give the proper contact between the printing plate and the sensitized surface, the light chamber can be moved quickly'by the ec- S to remove the printing plate from and again return it to the same position in proper contact with the sensitized surface. This enables avery rapid operation of the apparatus when repeating prints from the same printing plate. The shaft S is preferably turned by an operating handle T at its end whichis also utilized, as hereinafter explained, for similarly operating the back support.

U represents the back su port or device for pressing the sensitized part firmly against the printing plate. The back support is provided with a plurality of pressure heads it having facings of yielding material for contact with the sensitized part, and is mounted so that it can be turned to place any one of the pressure heads in position for use. The pressure heads are of different sizes and it is thus possible to use a pressure surface of appropriate size for the particular printing plate being used. This is a great advantage since if a pressure head having a larger area than the printing plate is used the sensitized plate is apt to be bent or indented and injured more or less by the edges or corners of the printing plate, especially if the glass printing plate is not perfectly flat or of uniform thickness throughout. This trouble is obviated byusing a pressure head of slightly smaller dimensions than the printing plate. Preferably the pressure heads are removably secured by set screws or otherwise on cylindrical studs u projecting laterally from the body of the back support so that the heads can be turned to a vertical or inclined position as may be necessary. This also enables a head to be removed and replaced by one of still another port, like the light chamber, is swiveled on a carriage a which travels on the main frame for moving the pressure head into and out of contact with the sensitized plate. This carriage is preferably mounted and guided on the back wing A of the -main frame in the same way that the light cham- The back sup- I ber carriage is mounted and guided. Means lating the movement substantially similar to those described in connection with the light chamber are preferably provided for turning the back support, for locking it from turning. for moving the carriage u and for regulating the movement of the carriage toward the sensitized part.

a Figs. 1 and 26, indicates the shaft connected by worm gearing u to the hub of the back support for turning it, and a is the bolt or locking device for holding-the back support from turning.

. u represents the adjusting shaft for the carriage u" which is connected to the carriage 'by a rack and pinion, and is turned by a crank at its end, as in the case of the light chamber.

u Fig. 1, indicates the adjustable stop which is engaged by the carriage for reguof the back support toward the sensitized part. This stop is mounted and adjusted in the 'same way as the stops 8 .for the light chamber.

a is the operating shaft for the lock by. which the carriage is locked to the slide which is actuated by the eccentric for moving the back'support a fixed short distance into and out of contact with the sensitized part.

As these various parts are constructed and operate substantially like the corresponding parts for the light chamber a more detailed description thereof is believed to be unnecessary.

u Fig. 26, represents a clamping plate for forcing the back support down to a firm seat on its carriage u As shown, this. clamping plate is located in the hollow body of the back support and bears at its edge on aflange u on the bottom of the back support against which it is forced y a nut u on a central bolt u exten ing u through the carriage and the hub of the back support. The nut u is adapted to be turned by a tool u inserted through holes u in the sides ofthe back support. The

back support could, if desired,'be clamped down on the carriage by means similar to those employed for the light chamber, or any other suitable means could be used for this purpose.

V represents the shaft to which is secured the eccentric for producing the limited movement ofthe back support toward and from the sensitized part. Preferably means are provided whereby the eccentric shaft V is adapted to be actuated by the same handle or device T that actuates the eccentric shaft S which reciprocates the light chamber. In the means shown for this purpose, see Figs. 1, 12, 24 and 25, the shaft V is connected by worm gearing o, a shaft 22, bevel gears vi, a shaft 0 bevel gears 0 a shaft 01 and l worm gearing 'v to a sleeve 2: whlch sur m les printing plate against the sensitized surface.

Any clutch device suitable for the purpose may be used. As shown in Figs. 12 and 24,

the shaft S is provided at its end with a fixed collar w on which the hub of the handle T is adapted to slide and turn. The hub of the handle T has a plate at its inner rounds and is adapted to turn independently end provided with teeth to and 'w on the opposite sides thereof. If the handle is shifted outwardly the teeth to will engage cooperating teeth on the collar 'w and couple the handle to the shaft S, whereas if the handle is shifted inwardly the teeth to will engage cooperating teeth w on the end of the sleeve 1: and couple the handle to said sleeve. The handle is shifted for this purpose by a screw w which turns in the outer end of the hub of the handle and engages in a screwthreaded hole in the end of the shaft S. The screw is turned by a crank at its outer end. vThe handle T can thus be readily coupled to theshaft S for turning it, or to the sleeve 12 for turning it, and the one handle serves for operating either the actuating eccentric s for the light chamber or the actuating eccentric for the back support. p

I claim as my invention:

.1. In a photographic printing apparatus, the combination of a support for a sensitized part,'a support which carries a plurality of p photographic printing plates, means for moving one of said supports toward the other to placeone of said printing plates in cont-act with the sensitized surface, and means for illuminating the printing plate, said support for the printing plates being rotatable to place one or another of the printing plates opposite the sensitized part.

2. In a photographic printing apparatus, the combination of a support for a sensitized part, a support which carries a plurality of photographic printing plates, -means for moving said latter support toward said other support to place one of said printing plates in contact with the sensitized surface, means forv illuminating the printing plate, and

means for turning said support for the printing plates to place one or another of the printing plates opposlte the sensitized part.

3. In a photographic printing apparatus,

the combination of a support for a sensitized part, asupport which carries a plurality of photographic printing plates, means for ad- 1 justing one of said supports parallel with 

